
<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS基本语法</title>
    <style>
        /* Css注释 */
        h1  {

             color: #ff0000;
               font-size: 5em;
        } 
         
    </style>
</head>
<body>
    <h1>对h1标签更改显示</h1>
</body>
</html>